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The rectum is the final straight portion of the large intestine in humans and some other mammals, and the gut in others. The adult human rectum is about 12 centimetres (4.7 in) long, and begins at the rectosigmoid junction, the end of the sigmoid colon, at the level of the third sacral vertebra or the sacral promontory depending upon what definition is used. Its caliber is similar to that of the sigmoid colon at its commencement, but it is dilated near its termination, forming the rectal ampulla. It terminates at the level of the anorectal ring (the level of the puborectalis sling) or the dentate line, again depending upon which definition is used. In humans, the rectum is followed by the anal canal, before the gastrointestinal tract terminates at the anal verge. The word rectum comes from the Latin rectum intestinum, meaning straight intestine.
Biology: The lining of the rectum is very thin and a ready route for disease and easy to rupture during the vigorous thrusting of anal sex — easy to contaminate your blood with fecal matter – the sphincter muscle of the anus can be damaged by too many intrusions making one incontinent – hemorrhoids and anal sex are surely incompatible.
Iraqi man with magnet in rectum causes bomb scare at LAX - Boing Boing
At the opened pelvic bone, use a sharp knife to make cuts to free the large intestine and rectum from the pelvic area.
Terry’s outrageous public statements - “A man putting his penis in another man’s rectum is not the basis for civil rights,” he said at his first news conference - had two results.
In 1983, very early in the epidemic, Joseph Sonnabend, MD, famously and courageously said, "the rectum is a sexual organ and it deserves the respect a penis gets and a vagina gets."
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